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This paper investigates the Direct Connect (DC) file sharing network, which to the best of the authors' knowledge, has never been academically studied before. They developed a participating agent, in order to gather protocol specific information. They quantify network characteristics such as distribution of users in hubs, hubs geography, queries distribution and trends in shared folder size. They also characterize the typical DC user: A heavy downloader with a particularly large shared folder. Most importantly, they discovered a query duplications problem that drains much of the hubs CPU and bandwidth resources. In the DC network, query facilitation is the most demanding task for hubs and the main factor in the protocol's scalability challenges.
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